CVE-2025-6026Public exploit

Metadata disclosure via improper TLS certificate validation

Published Oct 15, 2025 · Updated Oct 15, 2025

Improper certificate validation in Lenovo Universal Device Client before 25.7.0.21 allows man-in-the-middle attackers to read application metadata. The UDC TLS client accepts a substituted certificate during connections to Lenovo cloud services instead of enforcing the expected certificate pin, exposing device information, geolocation, and telemetry. The attacker must be able to intercept adjacent network traffic; the reported consequence is metadata disclosure, with no integrity or availability impact.

CVSS severity2.3
Low
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Lenovo Universal Device Client before 25.7.0.21 allows man-in-the-middle attackers to read application metadata. The UDC TLS client accepts a substituted certificate during connections to Lenovo cloud services instead of enforcing the expected certificate pin, exposing device information, geolocation, and telemetry. The attacker must be able to intercept adjacent network traffic; the reported consequence is metadata disclosure, with no integrity or availability impact.

The record

CVE
CVE-2025-6026
Published
Oct 15, 2025
Updated
Oct 15, 2025
Vendor
Lenovo
Product
Universal Device Client
Classifications
CWE-295, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <25.7.0.21

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Lenovo · Universal Device Clientversion=0 <25.7.0.21

Published CVSS scores

2.3Lenovo Group Ltd.CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
3.1Lenovo Group Ltd.CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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